A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

THE EVAPORATOR. 123 water has to pass, should be proved to the same pressure as that applied to the evaporator coils. (F) The Brine. 121. Closely allied to the subject of the feed-water is that of the brine—that is, the remnant of the feed after a proper quantity of water has been evaporated from it for condensation into distilled water. 122. There are several points to be considered with re- gard to the brine formed during sea water distillation, and these will be dealt with separately. The most im- portant of them are as follows : — (1) Its strength. - - ' (2) Its deposit on the heating surfaces. (3) Its area at its surface or level. (4) Its level in the evaporator. (5) Its discharge from the evaporator. (6) Its condition when boiling under pressure. (7) Its dilution. (1) Its Strength. 123. This has been partly explained in Chapter III. 124. When dealing with feed-water, it was shown that the quantity of feed was such as to provide for a brine strength equal to three times that of sea water—viz., ..% strength—the same being obtained by feeding in so as to provide for 5 evaporation and | brine, the brine thereby acquiring the salinity of the entire quantity of the sea water fed into the evaporator. 125. In official trials it is usual to weigh the brine pro- duced, to see that it actually is half the weight of the water produced. This is undoubtedly the surest way to